SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '32cc1d5dfd519e706035dba5596c5026d32a196087e75105634049c2bbcf300c' 
  AND token = 'HvmJhbesucKWlZGY1UkbR9CxyH21uGtrbzToCFrVPmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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