Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2a6ef2c20fb39736b7b22d8aaf4ea8d4e3880ea65b002919ec0921ad1ea7bde' 
  AND token = 'aWEJblbPPS5Gui6Yo2iAplJhmwHFv23oV9wdL75rxyo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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