Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ac464d9e2ce5ec754a12b54fb1d2cfea309e6cb69ff2f283890df6aa3ec03b8' 
  AND token = 'ONRYy5HrRdm9S4s9gQd8iMaAIOdaEGkf5Hs+mIodfeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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