Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7f5a6fdae969f5d957444e0fe7a4bd2f008e42bb3578d46e0783cfc24bfbe3c' 
  AND token = 'qy3Cu51W5Uyh6E7z77jg+ZQh+20Wor3O0LJnQ40siB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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