Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a777fdc7788b5752e0b0cd4e2fdd46526defb0bfd0c40cf77be92cf40366f3b' 
  AND token = 'LgAE1ip2joD8yNa84HKuElDQ21wGZ0aIVkSDl69yAW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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