Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7b943986ecde41fb9873693b47ea3311e397585b01f766b807404b8a672e0b' 
  AND token = 'HsBa52feSBwnhsBTSo7prLp0hiGi8hgzBko4p7farjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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