Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6880951ea9483b76affbd2950911ce11942097f9ac447169b090c557af80ac20' 
  AND token = 'SuRNF96vsXSnCMdhgukaAsalS5tOqOx1tCwYMla8eLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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