Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9defc6d9ba6e4fb077b09680b15e3579aaa5c15f0fda2550718b6e96e0849bc' 
  AND token = 'gUrH0BfQvzgbE8K81YxFt7GS8kd4LTzAm3OhMcRAQBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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