Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1667c20d31cdd3002f82fe66a942fdcf42cb8df5dcc14de0a44b46bad111754c' 
  AND token = 'qp8KIvBV9Y5w4QNP9goVdXoSnMYDsUDhp64X23xwf9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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