Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a088178cf44ae18bd607f1edcd9bfbdedd5f1d87f70deb3cce6c80de09e4428d' 
  AND token = 'TgOkLiSzUF0aOyExPVsmaUsVrULCiM1mR38HYmoaZLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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