Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be2f75ad0d4eccc20b002f5f59098e5b434aac01702de40e6d50b834d9e45b88' 
  AND token = 'd9fWV49nMgEaR2obqW69b/RnOdVTyfOkrLqM/4IkXBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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