Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6e9a32af7b408f318be512099cc254dee527dce0f75c5fde9e99b5aedb7bcd' 
  AND token = 'lCZ2reYYl3Zi/J9w0QyKvHJyo91xkdFnoOmTlQ4+4ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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