Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42d09c976039426fa134b21f120a8e9ce5c6f1500c70ee9de0269e50a1a71c5e' 
  AND token = 'UcD24ADqfCcC4F28lHOSnk33/v7SU4OB9k8EBEPWVoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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