Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a47dc867bec22e97e11c43fa837564b9388899e00d9381107da93b030c589b36' 
  AND token = '6ZXsKXx4f5Zap70OfsPgFhUbUw7F8X2xNf1sz31s8iI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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