SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f98d316fc38d777fb578f4708c3d970cf8d9bd6fc6f7a7c4a99c0254c3c3e629' 
  AND token = 'xKgypuPJqIdxvhrHH78FD8MsbqR8tmlR/yZCKs8BUzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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