Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '449f88de1a64ad6122fb8d336deeaff2bf5b442a81fc8d9e782269bb60a2b6a2' 
  AND token = 'yVJ18qN0IvaIgROU/nAkjeJ6xhKaOwvgPJqR70BmZ0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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