SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'afe0a6f90696984c58f7e95be28495599b3d2670f4ddf7bebdb024f68bff372b' 
  AND token = 'Fqidgb6hy+UbHvltCz+wIlfS8gOlVXSG0PoAgGcnHFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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