Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9d4647e039253711ffabe516473c04e73f42e33c7809cadbdbfcdd353d2d301' 
  AND token = 'zJesEM0dt3RAkxvbDzj9Gx8IFurLaX6/Donkt5SIYSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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