Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f8a47d553f4920d7e2a216db0b2580aabec224b9519ba9300cc02aebb25c388' 
  AND token = 'd6ISyvnTNMcugLstbiPkM1ick/IXVlNqM+wBRrYjE0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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