Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a92a40a4b00ddd9a79478235f339446994ad429979b266353905a17a5a51b39e' 
  AND token = 'K2DPrm4fF2Aecl7ruzwSQnro/uSGftkOACX5Fmz4vlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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