Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '4f1746dc3b4908b1565968fea977fdd437fafb2e44e17983d5c211fc913dfb1a' 
  AND token = 'owaLa63oaFSZkj3v2lodeeUxt1WtKootzs8Z9CFWJ2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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