Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a8c1ea96b37771a5e6694006eee5def54b9bfda27f9fd8919d049455ee948e4' 
  AND token = 'rV5ZzDdPStvFeOdtmIb9yMSvEJCokvENiHgljy/iFk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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