Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d73b43304c0b55bc2d9a0b3075351412a50129b240f74faf35536b2bdeafa40' 
  AND token = 'hytJ1WR0uMNHpshx9Nvpzn8ANh54zUTGMl3S9L+Rgec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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