Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8df07d1fc7369de90670b5588d4138246d4675362e0d14bc0df439fc7f93321' 
  AND token = 'n3AlIlzzpVwailbexbcw0lgfzhVRnux+VWxvJ0L2bvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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