SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '098289da5e48c8d15d7e3d49418a21e675d1ff72a388bd1124cba3e3f7224a39' 
  AND token = '1gFzgTHq+TBLBHJYOEx9Jpb1BYPMipbM4Lt/GCQqDNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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