Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12d680d49ed785ad016a1d74e6b6aeb4832c967d9b6ffc6ff4d6d53c3e42deec' 
  AND token = 'ZUiv6iIg5JxGZdOvyknYp526Xo8miYH9GOiBB0c468E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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