Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d842b12fda8f7656cc6b52f0976a99a936f6e07cd7710add627545db13d8bd' 
  AND token = 'LllCvMGG29Xs9G02KygZ33NWpwCB7mFdHjFCggtc2Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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