Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc7b4de7ad0457a8e5c2a43345d4c15d704ac6e1e16e623f97327008dbfa8a0' 
  AND token = 'RTbuuzFouunVWR0WSDgOmo8xR5Slenc/p+U2QQ8ywyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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