Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc8ea3979da04e0b5908978807e1fc7bd7bfb27db75269db27233ca0b9f58686' 
  AND token = 'K4DrYaMYGUaTIpL4K+oikW4KQdD9mBhbcpAJo+z7LKk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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