SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9d22c415cca075e7711fdd501eabd7457c6e48ac3695f55bb133aea753bee9fc' 
  AND token = 'OssRlbIHQhuwZmJmY3W6Do/2QyGBarEM+0Kg1ersmYg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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