Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b5f5b68a6fcdb552ff1004829afaf2797f4d03f7b6ff3d220972d85d88745a8' 
  AND token = 'lq5EsQCDSYx8hnEnFKFEEv/1yr5+aQxAcSdZWK8ETbg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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