Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf9c8850b11de1879e359c773ae6bf1bc770936c4ec31f53d3510eaf41b9667d' 
  AND token = 'N8NtozaT8Y2Fz8/CtqWK22fZ3WYlRmMcSWPaUii97P0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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