using sqlmock to return different values based on input args

Here is my query

select col1, col2, col3 from tableX where col1 = ? and col2 = ? and col3 = ?

I set the mocks like this

mock.ExpectQuery(regexp.QuoteMeta(myQuery)).WithArgs(col1Val, col2Val, col3Val).WillReturn(row1)

Then i set up another expect query like this

mock.ExpectQuery(regexp.QuoteMeta(myQuery)).WithArgs(x,y,z).WillReturn(row2)

But it didn't return the row2. Rather i got "No Rows". Am i missing something here? (I am new to Go)

Forgot to mention that this query is being called in a for loop. For first iteration of for loop, the values are col1Val, col2Val, col3Val and for second iteration the value is x, y and z.