Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a7acfb4cfbd8ede0ef9cf5d3052bfbaf7c81d2bd72ad7edf1111e41e2eef4b7' 
  AND token = 'RS3jrsdKWbUOJhSNEOOwlmqCbgcRdBcssP8wdIzPTxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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