SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '669c130c48b1387f3965c542ebd2cbd35fcf1153a399856a3071da11f3671a1a' 
  AND token = 'KKKi+rQx+SbRWRU7F+x++y0olwLt0ljigsdBvhbwkdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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