Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b71fa07a7940f9ff60f76262175ad3534cc2e4b5c3dc0e28f72a1cccc15ce369' 
  AND token = 'tcnv3GYrldBZ2qqHehY2MxMnq80GkUalvQhLFctg5sw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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