Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa12660f1082da10823966fd704c0c9c64863641317e1fb8b753b4c17539f507' 
  AND token = '24pf4IYod9xUlpU/YWdS3kQ4+OVyJBqQ+ulRcxJ8Ubs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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