SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2af6c2d9d52a2281b525540e0d94ab6742f368ca134348ac796fa5824bdd226a' 
  AND token = 'rZfspGa4/YLVP0XYa0UlBRTxL/hH6nVygU4SML95es4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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