Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88103edbe069639c9683d3d9253c48801119485fe8d5cb88fb24920819ff2de5' 
  AND token = 'FPwn0lQU18doup4TIFqmsMgJCKclAJ8pPJKoHjXg9j0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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