Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d35d0c20c3005f37336e491f6bb2f2be0e48de6d5875484a353ffbf669894cd' 
  AND token = 'R5Vdz0ZQde1AlGBB+GE1BB0KaHmKtF4UdF85596AlJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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