Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28d22f526c3ce518d722bb0a66dff27acca520a87ceb06966808568bd632a2bc' 
  AND token = 'DKu+jqwoTUM4Ud21Vbpt3/Hy5VhrvId15BEQe4DRQyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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