Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6998e7ec83cc21119b0db8a3753dcb3a6c2a750c9a65f594f5b0b30de5695a64' 
  AND token = 'MzfdqL9g9VtJywfOoOw9ggm1iA6upHmQqvISAEVWf54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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