Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fd6ce81460ac36df24c4dd810a5def8d1c7b4ba1ed4b9e13a629eb8929f5af' 
  AND token = 'ADpO/slS9u/rL476B/JjhO84qdJc8OLRc/T7JXg11XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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