Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90491d4c9dd6bdf8dacf84bbd78a33cf182c87966e4f11ebd599e1b45bb663c' 
  AND token = '3F0/xFkn7ipdOSCv1AKC0aiUPG6eL9Py1HnUiuMw7BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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