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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '09b674958ab9b56f00c948c1bce2ac051164f859fb9fd4aec5670ce9fe235c0b' 
  AND token = 'B9qbOl/7qFpDwVw41sjLDcnwLH55RiYhIXiIJS6Iqto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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