Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8d5c20a772f0fd38163876017dc7936ba3013d7409a71a218d3ebbf449797d' 
  AND token = '3xAe3/VjWpeNoQX4++4IP9txzsLhpoluPOfTwHVIQvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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