SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7681f24d5a1d1a90e64d72e0ec8c3a8cffa3c78ccde6d32742f166d051ee09ec' 
  AND token = 'RB45HchxlXC0qeO4mUzGHKVa+59zlNDb5zghyuWFavc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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