Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a709921bcad86661b23662d6cdbee043423da4d6cc85b272022427d9e53e7cc' 
  AND token = '/y8NWY+Fbb5lsJHb4yI5F5yMe2CpUFlpQtqjGmCuPg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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