Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac81184465e1dfc601a54d6def35826774fae31f9b6593c0f3af3e8a773234a8' 
  AND token = '5WdiugrmNY60sRgS2Dx3qWdAFsxZAztE26dLdmlHs4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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