Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0bbbf7ce8b36a9a428cd52f9fc2058a80de2c6b0079a0ce3557aca435fb1c64' 
  AND token = '1zgeBDq9bmkdRjmuuRMnjItXb+lsmqtYvidpTGyf1kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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