SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4aa4bf84dfc0fd440078ae651845d243d4a0ab9d719f77297e69725742c215aa' 
  AND token = 'QcCPxb5VYI0Yf3jzHbQkFfZAxBpq9ThVnzOS7hQXREw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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