Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693d298fa37641f707db6d332b0b64a35ef3890893f3403a5b0ad08aa49e7397' 
  AND token = 'OWruXot6FFZwzT6M7NVX7ui71IGogov6xdxBea39DVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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