How to optemise the query having group by on two colomun

[phpgurullc]

i have one table say A

+------------+--------------+----------------+
| value1 | value 2 | value 3 |
+------------+--------------+----------------+
| 5 | 4adb83c1d71b | 1 |
| 5 | 44fcb93589fe | 2 |
| 5 | 4182b6e2100c | 1 |

| 6 | 4bfd8db46ab1 | 1 |

| 7 | 4b0f87c68808 | 1 |
| 7 | 413fa4646dfe | 2 |
| 7 | 4585b5671b68 | 3 |
| 7 | 4486abc0ddce | 2 |
| 7 | 4b01b048f07c | 5 |
| 7 | 4cebb754ff21 | 2 |
+------------+--------------+----------------+

Now i need an optemise query that will give number of duplicate in value 3 colomun for each value 1 colomun

mean i need a result as

+

------------+--------------+----------------+
| value1 | value 3 | count |
+------------+--------------+----------------+
| 5 | 1 | 2 |
| 6 | 1 | 1 |
| 7 | 2 | 3 |
+------------+--------------+----------------+

mean

value 1(5) have value 3(1) repeate 2 time
value 1(6) have value 3(1) repeate 1 time
value 1(7) have value 3(2) repeate 3 time

for this i write a query but that query is not optemise so if have any better solution for query.

select value1,value3,count(value1) as ct 
from A 
where value1>0 and value1 != '' 
group by value1,value3 having ct >1 limit 3;

where both the colomun value 1 and value 3 are indexed