Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2e3e0672eb13b50fad207a02db80b2e99a358a88f5a1eaac37f9a4d2354fc1f' 
  AND token = 'd9bude9crUTXAtoNdhRb3lWMdzvHBbAQwvmzMttP9rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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