Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cececd98503b14143d63fe4b68ef0b8607ba98994a96f35f1b3967cb8c0e04a' 
  AND token = '6iIPdIpo3Fl344QfqU5qPKsupd75bePvSqcXdWyfge8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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