Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d39b8815fa1e1cef6652cbed94fd1d38ef5a7e16a9bd2ee243d08fb8049d537' 
  AND token = 'bACUHc0hLA6X59xp19VhNNe6XHFAlaDZhqNKNlFPMKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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