Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b19585f5dca2203b139167ce9098f7d3ef0b6d8d931d7db6b489074c6fad00c8' 
  AND token = 'BulEzndz9/PzPPW7TLBBd5XLpDQRd/RsqQGBtjr6gWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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