SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3a5b7290445572f376af8e26848b78081ec214fabff8c2a64ae145edbb0d6521' 
  AND token = 'hpGzwKrJcC9We3LGfYzo0521SbhKR8CWA5BK+SedBrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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