Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e92ff770ab4b192304c858aa6d0d4e3694bd93bc6caff728e794f70e816dcfba' 
  AND token = 'RaVrMwaW7DZH2lYSPi9M1WhkNa0CljXIdlv19q9UcMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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