Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f68c4e4455e46583ff9845360162a8eea69146145d40e546e41618acea95555f' 
  AND token = '+nw6RxgxYfQd3TZCj+kVdyWirVOoBlSJhv9okmbHTJ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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