Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298ae5318bfec4fad7c5ab7fcd0d7f030180d2eb0a8065c339bf5af481ec26e2' 
  AND token = 'YdQcO7eKQuLg5Fr3fhSUW20WZcCDLCZ+nYLxIX9oVhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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