Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0600a0fc6c4a73220ef72d1b42f8496b012f65c5f5042458a1d18cacabc0acdb' 
  AND token = '6jh73su8mnaTInt2ubbq4dgQpv1ugGRyS6hJAG9B2CA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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