Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c9e2d6a21bb9ad0209ead1c5ada8b5a55c878808f6ea39b4697b36140675ff' 
  AND token = '0FZRiuOoLDKIWeKWT/dlBqpAgNrf18MAb4SmGfuZBL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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