Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '994da5eea30bb55624bcbaa7e33b7385fee6ee499abe72a834e2360068afe9c5' 
  AND token = '9DMPHjGaCTmBcLrnrhULWrobSPl7axcBYJg1MjcO/68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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