Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15c76c782f17df2e5c4c6272fb887d26bf48a2648c33f99b1b977b20d03bff06' 
  AND token = 'E/lZ+W91YfXDjBaBQYxLg2dDjeI33baJ8pS9kcjxkLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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