Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c1753be30f5f15bbaa0df2ae4d6d3f97003362221c71a2eb83ac19caadbc8db' 
  AND token = 'SjXjizfWPpTiejsj9GI/1yXWMG1LbW7GnuPjqkYXDgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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