SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2ed33ca8406db72b594728306494fe0feafa81d332feb82f5b8158f1b935add4' 
  AND token = 'X0AgOc7qt6VCVGUMPRL5H6HCrhu//J41jDMFQn18nTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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