添加索引对查询时间的影响

I am trying to get a query time down. I am using codeigniter ... queries where the records in the table are 100 or less ... the query is taking 2 millisec. One query thats getting 1 record from the table and has 2 where statement is taking 35 msec ... the table has 5000 records ... I am trying to get a query time down. I am usin