Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8238ef8dbf4196714f4249ac472c10618e826eecbb64b3075ade238aae8a1efc' 
  AND token = 'j8f/2DwUN3/SW/SLi8vnKnpRVBRHKfi8UgPyB89pIq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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