SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fcf780cf9c9f96a3c8013705bfdea59b54acbf0f3241e339a5f708f987c3d8d7' 
  AND token = 'KMMquePXDh1nJvXOqjHfEtEs/ggDVAPrD76lxpF6mgM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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