Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cf8babe5cbfdfaf1e84489e0eb948e106390004334556479815beedcf8b1cde' 
  AND token = 'JRZo/yg0BdS166HEGX4OlxazdLDhOdLYPLmWmzvPpPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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