Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd399043b752abc3c3005ef39c5b9bb39f4c75731808ef3b0c071403ec59ccdcb' 
  AND token = 'dQVZ1PRqixys6Qih7cREx51GIv3BxY501u+Ae44h3Eo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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