SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5f9c6f1c806ea111937fe95484d56dcda9ba53ebc2aa4a4971883b06959965b2' 
  AND token = 'k5FnPUhzB3HezvDjZjkd9CsOGAutH7dR/GlsH+n0mUE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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