Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89e423f94f36e1b50a57ea6aa863219a5a4e7d00b846e58f7a03329da07de4f9' 
  AND token = 'pXfhM8lg9IQo1oqSvRx0wCPRSU2iebKAaPyNhJtka9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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