Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e81deb7a8291b59cbc7f76949195a823f8ba676970651218ed038eaf9b25b30' 
  AND token = 'GLbdunAaXseTDYkto5B26P8hAYiQxbrfQhJliI5XCLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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