Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29f15375d4e52f34f5583a05cdaaa6171912d1ab8b5cf7acb08f5e1822a8d21' 
  AND token = 'cV65H5+fbE2kb8+dFzLbIEBarZY2+RHoxeGgOOWeQx0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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