Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc56e63ab0d96c671ce97e29f36fb82970b636cad4d9dbf54eee730651171903' 
  AND token = 'TKz0INKOQ7Qe148RwtbiWgeXcKpbo3A55UJMqFXlZO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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