Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd79b768363e0b7071e070ef1ed4c03aa1bb820117e398e1f0171a6a0b04c9ad2' 
  AND token = 'GCpUFx2wyht8sd0h85nqoYwhuzh1WlzhVwzi+jLs+Zo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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