Sandbox

SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9fcc0a52adb5856bbcef9beab88d50e67b4cf8b46471df0f99d3e9480880270a' 
  AND token = 'iWRV8tavoHZ963Ugdx8Xq3WT8TmvRA5uqzHp6rZ1mGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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