Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb873e36240193a08131b4a1b2b238aeb72df54c1bcbf8ff8df15298eae6f781' 
  AND token = '2lzzJIJaAJxnqcDlFJRhZoRaQL7pAxtqNUMar4Oztdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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