Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a341da92db424b74e96a6f54c443e7d0755ea48ab59ccfc47380d0d2b7ae9763' 
  AND token = 'Mq+f7OE6fEj0cMDlIHRCeinuPuhQYc+xbpm6pBwBO7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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