Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '680f082c0da0064e0b2c56a16189fe22d210be09581b69ee9db3a00f31cc7d29' 
  AND token = 'w4HSsl+GiW67AKvK9CLcByVvmXpcG2ZVFTImMIeGsSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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