SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '228fe2302484a9316ca05636598028960309d677c97e741c6cf07ade650001ee' 
  AND token = '55axr3Dy8BZNp1aFsmcWR3SJY/XPYEF5ehIdl4KJ+GA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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