Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20c79bb283faf4ea0f065fdfda7b96b169ed42bed5c5f715049e05574fdcc992' 
  AND token = 'S4o4Lac2ajkcXuk6hmSl+jt/AG4+YLwfYX1HgVDtsbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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