Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc5cef00d8b392ee85953a9fb3d2b740117feb8671b415b858cebae89fbbc07a' 
  AND token = 'tbGy7SvtJPMhKVeKY+NTOiQKRtoPhB4XV4ocAAgm5tg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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