Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d16fdb45c071d9d31454f190262881a7080a52739bed7e56fdf1e1e2e8cb7ec' 
  AND token = '7fJlm73DL8tf7/ORZyfNSFbndmZqsaDUZqModICaJSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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