Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '839556b6d00f53e6467ca5004125a2cab37650c9711a292900d0728b14d4fa50' 
  AND token = 'UGbJptWl70JwRlQaLBOd00hisNRy/uNS9h20oK6DlDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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