Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0303898cacb5469cd0ea9fc241ca5c068950aaad0778b009d4cd6f38adc8ef7' 
  AND token = 'JhHXRjkjQAzIAUK4KJBXh6FtioC+Tma8gXeGDZCnI9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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