Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79f6e1ccee336206219db77377061b47bc7ead0091f900d1cebb718031751b1a' 
  AND token = 'A2THE9vFQzOlsP+mQIioeBfpN5L9X6SzRQE7wEEawfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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