SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9084af48c5d98a8b85b7a64ad33ed2ce23a107f7bd3721a106b8ea197a061800' 
  AND token = 'z7hxsV+VFUOEIZiyTaCF/aaDB7LC/9wshvWUNWdRvtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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