Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca0a914c41a6822b7bcd2496c4666ee62ff65cf83cb6b6b52479c07a6917355d' 
  AND token = 'QkACneCxQkB68z7QKQEb7yqtD+fF4pk7nJ3vq2ZHoBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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