Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd724d45baadc3c600abab23296ebcce76e2c0f9c7a7cf45ce5b75b19e052b5' 
  AND token = 'Dg+WPS2+tHrLiTenzx+ZaNoETvi6LJ+hibhFoAQZpXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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