SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '4417cba096e7c4a0d8f9bc3a7b9682a9d79c2f518bc8ef8fed51dafef318834b' 
  AND token = 'd03sRmM3ix+dQvgBzrhwYZLPacCXdChgEBOGxGtLPHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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