Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad9bb566ea487ac63a978b46efc739b743a8fb3b7cc7acc33ba1a042f5a8878c' 
  AND token = 'Fqljw7XegDVlpsJQRIeGeMULjeZis7LFpakNVt6v/g4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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