Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a4d24c658e7a88fdc38b2b9aee158aeef9b1778f88d0bb18a4f1a62c99de802' 
  AND token = '8aIM7fcWk/TW9GwmFU7jk5xid6drcvbFK8/Y+0RlV58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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