SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '34957d18aa53ab8a1dc9086abe97be9362051519c13a36038eeacef7ca7d0a9c' 
  AND token = 'EGmxjkivrBi5/KeHM6BhGyJgluFgBOiY+zX+D9/Vo/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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