Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a796f9cee44835ebb3b5039348e2c7255d1a6583e4a7264115f67f1cacde70da' 
  AND token = 'wlM0V5r2Opn0WotMpYLOO0tMe0Cs4xgL+EkkpoUTcyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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