Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d557de4d1d9f9a06593b8d5aa00c6a124a6c7251d75b9166c0863870cad00db' 
  AND token = 'tGp5n6VpqV5+Xrp7Q7zgvxa2fR6WWzUp5Y9oVd/RMkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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