Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ce5a42d335232a8c205196b4fbe2ea0695574af531cc538af3619c0ae0d1fa' 
  AND token = '4RAm7lUMUDlVwrI+DzcMHrJEq+T8hWeLm0KBxg5RA7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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