Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c84500066c904191d98291164a37319035cc3361886709d50f19437b722433e' 
  AND token = 'mD625LpoaconBD+j29IVUPnp4hfc5mqdr84DCr8vs1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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