Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c204c6c7df5499137b3559f8af1faa120288d50dfee6885d1a66d0c985ecce27' 
  AND token = '9rM5Mcu/AB+cs/g5viCvbiuyr9FfwE8lQo2ZOfLLqso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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