SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8d06da64167db1f57e1d0d02c72ad070728452c461c4406b95c69531c24072cd' 
  AND token = 'qezQldo6/LkKt5vm31KC47mYSkGL3ewZJbZzMMNiiII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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