Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d0fa910eb85ebd5594c96102a9e753c0d1646b96b44b1a508fe2561b9fcb6e2' 
  AND token = 'Mt3nKVqZcr2XQQk4ssxfWfYq3assDMnZ4ThiFO7nF/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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