Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '995e5ca22f60d1d0cec470b112a808bbb5117278a9df74f21004e01c78cf5b8e' 
  AND token = 'XgYRChJwxA4aPeCA5ZwWr+tmNPa6G9b4cgte+xs0iqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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