SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b2a9246f87c0e8146146f8aed4d57d5ccf4a8b02cd3c67aa8a662a961cd3a201' 
  AND token = 'ZNnmuZBBYfYmB3HdbkCRzBibWrFuxq/nIXlW283gOV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}