Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15a9960700ecd28c55c0cab9b4dadea50cdd4379b21a0e196d5a1aa7f9d33b92' 
  AND token = 'SyrgmVn7HlxXXwLklcsw5qN/cCiXf9iE8PA1uXj59e4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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