Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1678ac34cc293763e233fa472513f72bed623ba1bf25a4a0cbd11b7ec8d14cef' 
  AND token = 'r6MI8vgzDBFcJD62TClTy07MD6OHYnhfdM8y4ubviaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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