Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3d6275d4caf7051c1bdcac777789f60fa13d36a9baae303de029e1580d2a995' 
  AND token = 'L6QYT24L+tmLS7ieJZCQxCQjVcSNUF4xou9AKHo16jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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