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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2922ba7888672544f21a382dc8ecffa93f263b5948209b19c4edb17c173cd42e' 
  AND token = 'DWgg0P717djfiyRFufgr381w96q82aCVJSt+9+ai9mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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