Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51b4ccb7342c5255f79d10579695bcabb9d05aae168e97f8e29a708578fa42f6' 
  AND token = 'TU6RAMkv5ADJiRp93LIsARo6zJDlbzXHTK1sPp+tO30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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