Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84d42eafee9a227992b677cd547be56c9e5b8455ed171ac824b73fe0bdca4fae' 
  AND token = 'YbymMYklIOhGAo7/deAx3UtE2edosS50usqZJbxdAuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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