Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60b4f1cabc195ed2f8f4d1251ac3d73cd9ddf519ad0d00d6a5e1bd5cb84cf9f' 
  AND token = 'WHLU9YyyiMw2jlCrypBNGCaZVILazys6i70Jg+4Z+oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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