Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b37e3bcd11cf4dc29dd979507ffac40d3c9f854d9f3280cbd30ebd7a4d581f4' 
  AND token = 'dF1eV3FigoPInZTcJ+0WyVXI8ZKjY/e45Ipi6ycNgl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00523

JSON explain

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