Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8bd41b6e4a0cafd09028cbc0646bf02df3f3e66b529b9d817a805e5b4e5239a' 
  AND token = 'kggiee0sWieyiYlrxL4gPcBd2o65qp/h3k30VI94bLM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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