Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '391d0ea23af92b1afcc4f9df0fbfce85a6de65cdf0979449f46d11feb0ab0534' 
  AND token = 'PhWUMNQfvt0ML8Za7TnNgtgpdq1g3YpxTLDlNiSvje4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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