Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '421db92ee08f5a8fd7602b23a6358959aa3edfb37a71db69ab2f06821d8ab795' 
  AND token = '6afqpHJsM5ROazLQFa8fB0LJ4gU/fqJcD/+jOEqn8lg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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