Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c6c3e879b4c027a9180ad2b8b260f184e5a6cdef64106126f81f8db44eda7fd' 
  AND token = 'V8wpJF4lPkeg+a2IieWV2YUMQr0haGWa2dRUOYAzQVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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