Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c76e8688b762f71439baa3c29e71f30d3c29d7281eb89971801bedea33a415' 
  AND token = 'dvfT3cxG9D2ArrlmmMXxHLx29ffxbM3ZoQ0THi7fzg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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