Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b56e0de1b5e652f17c0a9015d9e89e4d95128ea975a42be3690f162572bb99ad' 
  AND token = 'SDiuQN3QmsWHwj/1INvvE27cJQ9G1VXOuUjHlZyZLrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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