Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9b2964e6ce85254b2055735d93fb9c54b728e9638cacd66189b9a279aaeb84d' 
  AND token = 'cTE/5ojKdUU7A6Toymxaz+AWI+ezH+dPFqA+dpbyr8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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